AutoCodes – Hummer – P0135 Hummer

P0135 Hummer Code - HO2S Heater Performance Bank 1 Sensor 1

Quick Answer

Heated Oxygen Sensors (HO2S) are used for fuel control and post catalyst monitoring. Common causes include Faulty Heated Oxygen Sensor (H2OS) Bank 1 Sensor 1, Heated Oxygen Sensor Bank 1 Sensor 1 harness is open shorted, Heated Oxygen Sensor Bank 1 Sensor 1 circuit poor electrical connection. Severity is Moderate - service should be scheduled soon. The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

What it means: P0135 Hummer indicates HO2S Heater Performance Bank 1 Sensor 1.
Common causes: Common causes include Faulty Heated Oxygen Sensor (H2OS) Bank 1 Sensor 1, Heated Oxygen Sensor Bank 1 Sensor 1 harness is open shorted, Heated Oxygen Sensor Bank 1 Sensor 1 circuit poor electrical connection.
Severity: Moderate - service should be scheduled soon.
Can I drive?: The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

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Code Popularity 21,106

How popular is this code, among other codes? Low

Repair Importance Level

Moderate (Service soon) (2 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Mar 23, 2024

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0135 Hummer Description

Heated Oxygen Sensors (HO2S) are used for fuel control and post catalyst monitoring. Each HO2S compares the oxygen content of the surrounding air with the oxygen content in the exhaust stream. The HO2S must reach an operating temperature to provide an accurate voltage signal. A heating element inside the HO2S minimizes the time required for the sensors to reach operating temperature. Voltage is provided to the heater by an ignition voltage circuit through a fuse. With the engine running, the ground is provided to the heater by the HO2S heater low control circuit through a low side driver within the Engine Control Module (ECM). The ECM uses Pulse Width Modulation (PWM) to control the HO2S heater operation to maintain a specific HO2S operating temperature range.
The Diagnostic Trouble Code (DTC) will be set when the ECM detects that the HO2S 1 heater current is out of factory specifications.

OBDII Code P0135 Hummer - HO2S Heater Performance Bank 1 Sensor 1 - AutoCodes.com — P0135 Hummer Code - HO2S Heater Performance Bank 1 Sensor 1

What does this mean?

What are the Possible Causes of the DTC P0135 Hummer?

Faulty Heated Oxygen Sensor (H2OS) Bank 1 Sensor 1
Heated Oxygen Sensor Bank 1 Sensor 1 harness is open shorted
Heated Oxygen Sensor Bank 1 Sensor 1 circuit poor electrical connection
Heated Oxygen Sensor Bank 1 Sensor 1 circuit fuse
Faulty Engine Control Module (ECM)

How to Fix the DTC P0135 Hummer?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What does this mean?

Code Tech Notes

The code means that there is a problem with the heater element circuit of the heated oxygen sensor. The control module monitors how long it takes the sensor to warm up and start sending an adequate signal. The code is set when the sensor is taking too long to warm up. Water getting inside the heated oxygen sensor connector can cause the heated oxygen sensor fuse to blow. Before replacing the sensor, check for the condition of the heated oxygen sensor fuse and connectors. If the fuse and connector are OK, replacing the O2 Sensor usually takes care of the problem.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0135 Hummer code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0135 Hummer Code

1. What is the P0135 OBDII code for Hummer?

The P0135 code for Hummer indicates a malfunction in the HO2S (Heated Oxygen Sensor) heater circuit for Bank 1 Sensor 1.

2. What are the common symptoms of a P0135 code in a Hummer?

Common symptoms of a P0135 code in a Hummer include poor fuel efficiency, rough idling, engine stalling, and an illuminated Check Engine Light.

3. What are the possible causes of a P0135 code in a Hummer?

Possible causes of a P0135 code in a Hummer can include a faulty oxygen sensor, damaged wiring or connectors, a blown fuse, or a malfunctioning PCM (Powertrain Control Module).

4. How can I diagnose a P0135 code in my Hummer?

Diagnosing a P0135 code in a Hummer involves using an OBDII scanner to retrieve the code, inspecting the oxygen sensor and related wiring, checking for blown fuses, and testing the sensor heater circuit.

5. Can I still drive my Hummer with a P0135 code?

It is not recommended to drive your Hummer with a P0135 code as it can lead to poor engine performance and potentially cause further damage to the vehicle.

6. How do I repair a P0135 code in my Hummer?

To repair a P0135 code in a Hummer, you may need to replace the Bank 1 Sensor 1 oxygen sensor, repair any damaged wiring or connectors, replace blown fuses, or reflash the PCM if necessary.

7. Will resetting the trouble codes make the P0135 code go away in my Hummer?

Resetting the trouble codes may temporarily clear the Check Engine Light, but if the underlying issue causing the P0135 code is not addressed, the code is likely to return.

8. How much does it typically cost to fix a P0135 code in a Hummer?

The cost to fix a P0135 code in a Hummer can vary depending on the exact cause of the issue, but it may range from $100 to $400 for parts and labor.

9. Can a DIY enthusiast repair a P0135 code in a Hummer?

While some experienced DIY enthusiasts may be able to diagnose and repair a P0135 code in a Hummer, it is recommended to consult a professional mechanic for accurate diagnosis and proper repair.

10. How important is it to address a P0135 code promptly in a Hummer?

It is important to address a P0135 code promptly in a Hummer to prevent potential damage to the engine, ensure optimal fuel efficiency, and maintain the overall performance of the vehicle.